Journal Article

The evolution of galaxy clustering since <i>z</i>= 3 using the UKIDSS Ultra Deep Survey: the divergence of passive and star-forming galaxies

W. G. Hartley, O. Almaini, M. Cirasuolo, S. Foucaud, C. Simpson, C. J. Conselice, I. Smail, R. J. McLure, J. S. Dunlop, R. W. Chuter, S. Maddox, K. P. Lane and E. J. Bradshaw

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 407, issue 2, pages 1212-1222
Published in print September 2010 | ISSN: 0035-8711
Published online September 2010 | e-ISSN: 1365-2966 | DOI:
The evolution of galaxy clustering since z= 3 using the UKIDSS Ultra Deep Survey: the divergence of passive and star-forming galaxies

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We use the UKIDSS Ultra Deep Survey to trace the evolution of galaxy clustering to z= 3. Using photometric redshifts derived from data covering the wavelength range 0.3–4.5 μm, we examine this clustering as a function of absolute K-band luminosity, colour and star formation rate. Comparing the deprojected clustering amplitudes, we find that red galaxies are more strongly clustered than blue galaxies out to at least z= 1.5, irrespective of rest-frame K-band luminosity. We then construct passive and star-forming samples based on stellar age, colour and star formation histories calculated from the best-fitting templates. The clustering strength of star-forming galaxies declines steadily from r0≃ 7 h−1 Mpc at z≃ 2 to r0≃ 3 h−1 Mpc at z≃ 0, while passive galaxies have clustering strengths up to a factor of 2 higher. Within the passive and star-forming subsamples, however, we find very little dependence of galaxy clustering on K-band luminosity. Galaxy ‘passivity’ appears to be the strongest indicator of clustering strength. We compare these clustering measurements with those predicted for dark matter haloes and conclude that passive galaxies typically reside in haloes of mass M≥ 1013 M while luminous star-forming galaxies occupy haloes an order of magnitude less massive over the range 0.5 < z < 1.5. The decline in the clustering strength of star-forming galaxies with decreasing redshift indicates a decline in the hosting halo mass for galaxies of a given luminosity. We find evidence for convergence of clustering in star-forming and passive galaxies around z∼ 2, which is consistent with this being the epoch at which the red sequence of galaxies becomes distinct.

Keywords: galaxies: evolution; galaxies: formation; galaxies: high-redshift; large-scale structure of Universe; infrared: galaxies

Journal Article.  8829 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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